Today's Message Index:
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1. 04:53 AM - Rocky Mountain Instrument Information ()
2. 06:52 AM - Horizon Inst P-1000 (Ron Quillin)
3. 07:24 AM - Re: Horizon Inst P-1000 (BobsV35B@aol.com)
4. 08:10 AM - Re: Dan's Jabiru 3300 Wiring Schematic (user9253)
5. 09:11 AM - Re: Re: Dan's Jabiru 3300 Wiring Schematic (Robert L. Nuckolls, III)
6. 09:29 AM - Re: Dan's Jabiru 3300 Wiring Schematic (messydeer)
7. 09:41 AM - Re: Horizon Inst P-1000 (David LLoyd)
Message 1
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Subject: | Rocky Mountain Instrument Information |
8/25/2009
This is provided for your information:
"NEW SALES HAVE BEEN DISCONTINUED! Rocky Mountain Instrument has
discontinued sales of both the microEncoder and the microMonitor. We will
continue technical support, repairs and upgrades for as long as possible.
As you can imagine, some custom components for the units are high cost and
must be purchased in large quantities. It is not practical or profitable to
continue to offer new kits or assembled units."
'OC' Says: "The best investment we can make is the effort to gather and
understand knowledge."
Message 2
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Subject: | Horizon Inst P-1000 |
Wondering if any have information on this tach?
http://www.horizoninstruments.com/
Operations manual, install manual, experience with one, other...?
TIA
Ron Q.
Message 3
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Subject: | Re: Horizon Inst P-1000 |
Good Morning Ron,
We have one installed in our Beech J35. Works great!
What would you like to know? I may be able to find the data you need, but,
in the meantime, I might be able to answer an easy question<G>.
Happy Skies,
Old Bob
In a message dated 8/25/2009 8:54:16 A.M. Central Daylight Time,
rjquillin@gmail.com writes:
--> AeroElectric-List message posted by: Ron Quillin <rjquillin@gmail.com>
Wondering if any have information on this tach?
http://www.horizoninstruments.com/
Operations manual, install manual, experience with one, other...?
TIA
Ron Q.
Message 4
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Subject: | Re: Dan's Jabiru 3300 Wiring Schematic |
Dan,
Just a suggestion, put the cabin lights and instrument lights on separate fuses
so everything does not go dark at once.
Here is the installation manual for the MGL RDAC VD if you do not have it:
http://www.mglavionics.com/RDAC_VD_installation.pdf
Quoting from the manual concerning the tach signal input:
> After you have connected the rev counter terminal to the signal source you
> need to set the number of pulses per 10 revolutions in the Calibration Menu.
> The calibration itself depends on your engine type and what kind of signal you
> are using. Typical sources are:
> Magneto coils (suitable signal at the kill switch).
> Primary (low voltage) side of ignition coil, at contact breaker or electronic
> ignition module.
> RPM counter output of electronic ignition systems (for example Bosh
> Motronic).
> RPM pickup devices such as hall-effect sensors on flywheels etc.
> Typical calibration settings are 10 or 20 for most engines. Other pulse counts
> per 10 revolutions are also possible for some engines.
> Please note: On some of the Stratomaster instruments pulse counts are
> entered as pulses per ten revolutions, on others it is pulses per single
> revolution with a decimal point (i.e. 1.0).
> The rev counter input on the RDAC can be used with signals from about 5Vpp
> to as much as 100Vpp. A noise filter is included that results in the input
> ignoring any noise signals as long as this is below the detection threshold of
> about 2.5Vpp. The input impedance of the rev counter input is approximately
> REV counter wire from ignition system
> 10Kohm. You can use series resistors as well as load resistors for
> applications that have unusual signals.
Although the manual lists the magneto kill switch as a possible tach signal source,
any fault in the signal wire would short out the magneto. Who knows what
affect the 10K ohm impedance of the RDAC VD would have on the ignition system?
Since the dynamo is integrated with the flywheel and generates AC voltage,
it should provide the RPM signal. It is worth a try.
Bob said:
> You show a tach signal off the AC widings of the altenrator.
> This will not be useful with the alternator disconnect relay
> open.
Bob, I do not understand this, since the tach signal wire is connected to the alternator
side of the disconnect relay. Doesn't the alternator continue to generator
voltage whether there is a load on it or not? Or does the regulator open
the grounded alternator lead?
Joe
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=259489#259489
Message 5
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Subject: | Re: Dan's Jabiru 3300 Wiring Schematic |
>
>Although the manual lists the magneto kill switch as a possible tach
>signal source, any fault in the signal wire would short out the
>magneto. Who knows what affect the 10K ohm impedance of the RDAC VD
>would have on the ignition system? Since the dynamo is integrated
>with the flywheel and generates AC voltage, it should provide the
>RPM signal. It is worth a try.
Resistances as low as a few hundred ohms will probably
have no effect on ignition performance . . . the kill
switch on magneto-type ignition systems generally places
a dead short on a few turns of the spark voltage coil
thus killing it's ability to function. This is a rather
low impedance energy source and not easily "loaded"
to the extent that the ignition fails. The biggest
problem with getting tach data from ignition sources
is the very trashy waveform that CAN be easily signal
conditioned if the tach designer is aware of the
signal's characteristics.
>Bob said:
> > You show a tach signal off the AC widings of the altenrator.
> > This will not be useful with the alternator disconnect relay
> > open.
>Bob, I do not understand this, since the tach signal wire is
>connected to the alternator side of the disconnect relay. Doesn't
>the alternator continue to generator voltage whether there is a load
>on it or not? Or does the regulator open the grounded alternator lead?
The alternator leads go to a bridge rectifier's AC
input poles . . . neither goes to ground.
Availability of a predictable signal from the
AC windings assumes that the system is producing
power normally. Now, there is SOME sort of signal
present with the relay open . . . but its characteristics
are different that for normal operation. The
designer of the tachometer probably wasn't tasked
with covering this case so useful operation becomes
problematic.
Bob . . .
---------------------------------------
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
---------------------------------------
Message 6
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Subject: | Re: Dan's Jabiru 3300 Wiring Schematic |
Thanks, Joe :-)
I'd heard of getting a tach signal from the P-leads. This must be the same as what
they talk about with the mags. And would have the same risks of grounding,
I would think.
> You show a tach signal off the AC widings of the altenrator.
> This will not be useful with the alternator disconnect relay
> open.
Here's my understanding: the alternator has two leads of AC coming out. With AC,
one lead will have current go out, while the other has it come in (like a ground?).
The leads switch every 180. So opening just one of the leads kills output,
just like breaking a ground connection in a DC circuit.
It also seems that if I did get the tach signal here, then I would have a defacto
open alternator disconnect relay alarm: no tach would mean relay open.
--------
Dan
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=259502#259502
Message 7
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Subject: | Re: Horizon Inst P-1000 |
Horizon Tach......
I have used this tack in my Cessna 185 for 5+ years. Always works as
advertized.
A couple of hidden great benefits to using this tach....
* you are alerted via the 2 red LED 'status' lights if a "P" lead breaks
from its mag. Thus, you know immediately that you have a hot mag. that
needs fixing,
* the high resolution of rpm information is very beneficial when doing
things like mixture leaning, mag checks, taxi leaning, etc.
Dave
-----------------------------------------------------------------------------
----- Original Message -----
From: "Ron Quillin" <rjquillin@gmail.com>
Sent: Tuesday, August 25, 2009 6:50 AM
Subject: AeroElectric-List: Horizon Inst P-1000
>
> Wondering if any have information on this tach?
>
> http://www.horizoninstruments.com/
>
> Operations manual, install manual, experience with one, other...?
>
> TIA
> Ron Q.
>
>
>
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